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Bit
Bit Name
4
SOL
3
SOLP
2
SCKS
1
CSS1
0
CSS0
Initial
Value
R/W
0
R/W
1
R/W
0
R/W
0
R/W
0
R/W
Section 17 Synchronous Serial Communication Unit (SSU)
Description
Serial Data Output Value Select
The serial data output retains its level of the last bit
after completion of transmission. The output level
before or after transmission can be specified by setting
this bit. When specifying the output level, use the MOV
instruction after clearing the SOLP bit to 0. Since writing
to this bit during data transmission causes malfunctions,
this bit should not be changed.
0: Serial data output is changed to low.
1: Serial data output is changed to high.
SOL Bit Write Protect
When changing the output level of serial data, set the
SOL bit to 1 or clear the SOL bit to 0 after clearing the
SOLP bit to 0 using the MOV instruction.
0: Output level can be changed by the SOL bit
1: Output level cannot be changed by the SOL bit. This
bit is always read as 1.
SSCK Pin Select
Selects that the SSCK pin functions as a port or a serial
clock pin. When the SSCK pin is used as a serial clock
pin, this bit must be set to 1.
0: Functions as an I/O port.
1: Functions as a serial clock.
SCS Pin Select
Select that the SCS pin functions as a port or SCS input
or output. However, when MSS = 0, the SCS pin
functions as an input pin regardless of the CSS1 and
CSS0 settings.
00: I/O port
01: Function as SCS input
10: Function as SCS automatic input/output (function as
SCS input before and after transfer and output a
low level during transfer)
11: Function as SCS automatic output (outputs a high
level before and after transfer and outputs a low
level during transfer)
Rev. 1.00 Mar. 12, 2008 Page 555 of 1178
REJ09B0403-0100
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